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Human Reproduction, Vol. 18, No. 2, 408-416, February 2003
© 2003 European Society of Human Reproduction and Embryology

Effects of myo-inositol on the in-vitro maturation and subsequent development of mouse oocytes

Tony Tak Yu Chiu1, Michael Scott Rogers, Christine Briton-Jones and Christopher Haines

Department of Obstetrics & Gynaecology, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China

1 To whom correspondence should be addressed at: Department of Obstetrics & Gynaecology, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong SAR, China. e-mail:tonychiu{at}cuhk.edu.hk

BACKGROUND: The study aim was to assess whether the incorporation of myo-inositol (MI) into culture medium could improve oocyte maturation in vitro. METHODS AND RESULTS: We performed a controlled prospective study using female ICR strain mice superovulated with pregnant mare’s serum gonadotrophins. Cumulus-enclosed germinal vesicle (GV) oocytes were randomly cultured in medium with or without MI supplementation. The kinetics of GV breakdown after 4 h of incubation was significantly higher in oocytes incubated with 30 mmol/l of MI than in controls (P < 0.001). Accordingly, this concentration of MI was used for subsequent experiments. The proportion of metaphase II oocytes achieved after 24 h of culture, their fertilization and cleavage rates were significantly higher in the MI-treated group (P < 0.01, P < 0.05, P < 0.05 respectively). This group also demonstrated significant improvement in postimplantation development after transferring the 2-cell embryos to pseudopregnant mice. Confocal microscopy revealed spontaneous intracellular Ca2+ oscillations within competent GV oocytes and treatment with MI caused an earlier onset of these Ca2+ signals. CONCLUSIONS: Our results suggest that MI may affect meiotic progression of mouse GV oocytes possibly by enhancing the intracellular Ca2+ oscillations. Supplementation of MI in culture medium may be useful for human oocyte maturation.

Key words: embryo development/intracellular Ca2+ fluxes/mouse/myo-inositol/oocyte maturation


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